4. Troubleshooting
4-4
4.2.4
Engine revolutions will drop before rises up to rated pressure
4.2.5
Engine will not turn to meet rated revolutions
※
1: For the detailed countermeasures, refer to “Troubleshooting manual”, “Workshop manual”
published by engine manufacturer.
Faulty adjustment of
pressure
Re-adjust pressure
Check adjustment of
pressure regulator
Adjustment
Check needle valve of
pressure regulator
Faulty needle valve or
needle valve seat spring
Replace assembly
Change pressure gauge for
replacement one, and
re-adjust pressure gauge
Faulty pressure gauge
Adjustment
Replace assembly
Faulty adjustment
Faulty adjustment
Faulty
Full load adjustment screw
rotation speed of the
accelerator controller is
sure has been adjusted
Faulty adjustment
Re-adjust
Faulty
adjustment
Check if engine controller
(ECM) functions well
Faulty engine controller
(ECM) or cable connection
Replace it or repair
connection
Check accelerator
controller output voltage
Engine is in trouble
Repair the trouble and get
rid of the cause
Check how fuel
transported or if any air
mixed
Fuel feed pump clogging
Faulty fuel pipes
Clean strainer
Repair pipes
Bleed air
Air filter clogging
Clean or replace
Check adjustment of
pressure regulator
Clogging is
large
Normality
Normality
Faulty
Normality
Normality
Faulty
Normality
Faulty adjustment of
pressure
Re-adjust pressure
Adjustment
Faulty adjustment
Check air filter
Filter element clogging
Replace it
Check fuel filter and fuel
pre-filter
Clogging is
large
Check pressure sensor
output voltage
Faulty pressure sensor
More than
DC0.5V
Replace it
Normality
DC0.5V
Input cable connection or
accelerator controller fails
Less than
DC4.0V
Repair input cable
connection or replace the
controller
Normality
DC4.0V
B
C
D
※
1
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